Hi,
In order to get xdm/greet working on macos mojave, pam support needs
to be enabled in the build.
I also copied the /etc/pam.d/login to /etc/pam.d/xdm.
cat /etc/pam.d/xdm
auth optional pam_krb5.so use_kcminit
auth optional pam_ntlm.so try_first_pass
auth optional pam_mount.so try_first_pass
auth required pam_opendirectory.so try_first_pass
account required pam_nologin.so
account required pam_opendirectory.so
password required pam_opendirectory.so
session required pam_launchd.so
session required pam_uwtmp.so
session optional pam_mount.so
Cheers,
Dimitris